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⛰️ The Rocky Mountains and how a range is born

Trace the ancient rocks, shallow subduction, uplift, erosion, and ice that built the Rocky Mountains.

4
lessons
~30 min
to learn
Adults
level
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What you’ll learn

  1. A range with a deep pastDistinguish ancient basement, older mountain episodes, and sedimentary layers from the modern Rocky Mountain uplift.The range inherited ancient crystalline rocks and a long record of earlier uplift, erosion, burial, and shallow-sea deposition.
  2. The Laramide engineExplain how shallow subduction and thick-skinned compression raised the modern Rocky Mountain blocks.The Farallon slab traveled unusually far inland, reactivated old structures, and lifted basement along reverse faults during the Laramide Orogeny.
  3. Erosion makes the skylineSeparate tectonic construction from the river and glacial processes that sculpted the visible peaks and valleys.Uplift created relief, while erosion and later glaciers carved valleys, exposed basement, and shaped the familiar skyline.
  4. Many ranges, one familyCompare Rocky Mountain provinces and connect their topography to drainage and continuing surface change.The Rockies are a diverse system whose uplifted terrain separates river basins and continues to evolve through erosion, ice, and isostatic adjustment.

Questions this course answers

Why can a mountain be young as a landform but contain very old rock?

Mountain building raises and exposes rocks that formed deep in the crust long before the present skyline existed.

What made the Laramide unusual?

The shallowly subducting plate reached beneath the continental interior and helped drive inland deformation.

Which process made many U-shaped valleys and sharp arêtes?

Moving valley glaciers widened and deepened earlier river valleys, leaving characteristic glacial landforms.

What does the Continental Divide primarily separate?

The divide follows high ground that sends precipitation into different continental drainage systems.

What does thick-skinned deformation mean in many Rocky Mountain ranges?

Laramide compression reached into ancient crystalline basement and lifted large crustal blocks along faults.

Why are erosion and uplift best understood together?

The height and shape of a range reflect the competition between tectonic uplift and surface lowering.

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